Uncertainty In Acoustics
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Uncertainty In Acoustics
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Author : Robert Peters
language : en
Publisher: CRC Press
Release Date : 2020-07-27
Uncertainty In Acoustics written by Robert Peters and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-27 with Technology & Engineering categories.
This guide to estimating uncertainties in the measurement, prediction and assessment of noise and vibration applies across environmental noise and vibration, occupational noise and vibration exposure, and building and architectural acoustics. The book collates information from the various Standards and from research, with explanation, examples and case studies. It enables estimation of uncertainty in the measurement and prediction of acoustic quantities, suitable for use in environmental impact and occupational exposure assessments. It is for acoustic consultants, mechanical and building service engineers, architect and building professionals and environmental health officers. Bob Peters worked for more than forty years in acoustics and noise control – teaching, research, consultancy. He was a principal acoustic consultant with Applied Acoustic Design, a senior research fellow at London South Bank University, and a tutor on Institute of Acoustics distance learning courses.
The Cost Of Uncertainty In Acoustic Measurements
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Author : KM. Eldred
language : en
Publisher:
Release Date : 1979
The Cost Of Uncertainty In Acoustic Measurements written by KM. Eldred and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Costs of uncertainty categories.
The cost of uncertainty in noise measurements is reviewed in order to address real tangible costs borne both by firms that have to quiet plant equipment to noise levels below the regulations, and by individuals who are exposed to noise levels above the regulations. The potential annual costs of uncertainties in just one case study--potential product noise regulations--are shown to be of the order of 300 to 500 million dollars, on a present value basis over a ten year period, although substantial uncertainty in these estimates is probable. The economic implications of noise measurement uncertainty are related to the purposes of noise measurement standards, and the significance of measurement uncertainty for the use and consequences of standards in noise regulations is discussed.
Uncertainties In Acoustical Transfer Functions
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Author : Pascal Dietrich
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2013
Uncertainties In Acoustical Transfer Functions written by Pascal Dietrich and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Technology & Engineering categories.
Measured transfer functions of acoustic systems are often used to derive single-number parameters. The uncertainty analysis is commonly focused on the derived parameters but not on the transfer function as the primary quantity. This thesis presents an approach to assess the uncertainty contributions in these transfer functions by using analytic models. Uncertainties caused by the measurement method are analyzed with a focus on the underlying signal processing. In particular, the influence of nonlinearities in the acoustic measurement chain are modeled to predict artifacts in the measured signals and hence the calculated acoustic transfer function. Secondly, characterization methods commonly applied in the field of signal processing are linked to the acoustic scenarios and the main influencing parameters. Acoustic parameters are then derived analytically and by means of Monte Carlo simulations considering the uncertainty of these input parameters. In order to provide airborne applications, analytic models for sound barrier and room acoustic measurements are developed incorporating the directivity and the orientation of the sound source as well as the positions of sources and receivers. The simulated uncertainty contributions are validated by measurements. The same approach is also applied to structure-borne sound applications.
Measurements In Room Acoustics
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Author : Ingo B. Witew
language : en
Publisher:
Release Date : 2022
Measurements In Room Acoustics written by Ingo B. Witew and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Underwater Acoustics And Ocean Dynamics
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Author : Lisheng Zhou
language : en
Publisher: Springer
Release Date : 2016-10-17
Underwater Acoustics And Ocean Dynamics written by Lisheng Zhou and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-17 with Science categories.
These proceedings are a collection of 16 selected scientific papers and reviews by distinguished international experts that were presented at the 4th Pacific Rim Underwater Acoustics Conference (PRUAC), held in Hangzhou, China in October 2013. The topics discussed at the conference include internal wave observation and prediction; environmental uncertainty and coupling to sound propagation; environmental noise and ocean dynamics; dynamic modeling in acoustic fields; acoustic tomography and ocean parameter estimation; time reversal and matched field processing; underwater acoustic localization and communication as well as measurement instrumentations and platforms. These proceedings provide insights into the latest developments in underwater acoustics, promoting the exchange of ideas for the benefit of future research.
Software Based Acoustical Measurements
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Author : Federico Miyara
language : en
Publisher: Springer
Release Date : 2017-05-26
Software Based Acoustical Measurements written by Federico Miyara and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-26 with Science categories.
This textbook provides a detailed introduction to the use of software in combination with simple and economical hardware (a sound level meter with calibrated AC output and a digital recording system) to obtain sophisticated measurements usually requiring expensive equipment. It emphasizes the use of free, open source, and multiplatform software. Many commercial acoustical measurement systems use software algorithms as an integral component; however the methods are not disclosed. This book enables the reader to develop useful algorithms and provides insight into the use of digital audio editing tools to document features in the signal. Topics covered include acoustical measurement principles, in-depth critical study of uncertainty applied to acoustical measurements, digital signal processing from the basics, and metrologically-oriented spectral and statistical analysis of signals. The student will gain a deep understanding of the use of software for measurement purposes; the ability to implement software-based measurement systems; familiarity with the hardware necessary to acquire and store signals; an appreciation for the key issue of long-term preservation of signals; and a full grasp of the often neglected issue of uncertainty in acoustical measurements. Pedagogical features include in-text worked-out examples, end-of-chapter problems, a glossary of metrology terms, and extensive appendices covering statistics, proofs, additional examples, file formats, and underlying theory.
Noise Emission Measurements For Regulatory Purposes
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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1977
Noise Emission Measurements For Regulatory Purposes written by United States. National Bureau of Standards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Noise categories.
Managing Uncertainty In Building Acoustics
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Author : Christian Simmons
language : en
Publisher:
Release Date : 2009
Managing Uncertainty In Building Acoustics written by Christian Simmons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Acoustics Measurement Of Airborne Noise Emitted By Construction Equipment Intended For Outdoor Use Method For Determining Compliance With Noise Limits
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Author : SLTC - Earth Moving Machinery Sound Level
language : en
Publisher:
Release Date : 1991
Acoustics Measurement Of Airborne Noise Emitted By Construction Equipment Intended For Outdoor Use Method For Determining Compliance With Noise Limits written by SLTC - Earth Moving Machinery Sound Level and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
This SAE Standard describes a method for measuring the weighted sound pressure levels at prescribed microphone positions in the proximity of a device or machine for outdoor use, in order to determine compliance with noise limits. The A-weighted sound power level of the source is calculated from the measured values. NOTES:1. When nine or more microphone positions are prescribed in the proximity of the source (as in Section 7), the A-weighted sound power levels determined in accordance with this document tend to result in standard deviations less than approximately 2 dB, provided that the spectrum does not contain pronounced discrete frequencies; if it does, the magnitude of the uncertainties will be larger and no general rules for the magnitude of the uncertainties can be given. These standard deviations reflect the cumulative effects of all causes of measurement uncertainty, excluding variations in the sound power level from machine to machine or from test to test, which may be caused, for example, by changes in the mounting or operating conditions of the source. 2. For measurements made using a hemispherical measurement suface, the directivity index of the source may be calculated according to the description of appendix B. 3. Measurement of A-weighted sound pressure levels at the operator's postion(s) is not described in this document. 4. The results of noise measurements made according to this document are obtained under prescribed conditions and iwll not necessarily correspond to the noise experienced from the equipment when it is in operation on a construction site.
Gb Z 27764 2011 Translated English Of Chinese Standard Gb Z 27764 2011 Gbz27764 2011
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Author : https://www.chinesestandard.net
language : en
Publisher: https://www.chinesestandard.net
Release Date : 2023-06-25
Gb Z 27764 2011 Translated English Of Chinese Standard Gb Z 27764 2011 Gbz27764 2011 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-25 with Technology & Engineering categories.
This guiding technical document stipulates the measurement of normal incidence sound insulation (or normal incidence sound transmission loss) of acoustic materials or acoustic structures, in impedance tubes, by using the transfer matrix method. This guiding technical document is applicable to the measurement of the normal incidence sound insulation of locally reactive acoustic materials, such as sponges, cotton felts, soft thin plates, whose test frequency is in the quality control area (that is, there is no sound propagation parallel to the material inside the material). It is applicable to the comparison of sound insulation performance of acoustic materials, in the development stage. Since the sound transmission loss of a material is closely related to its physical properties (such as elastic modulus, density, structure factor, etc.), the measurement methods specified in this guiding technical document can be applied to relevant basic research and product development. This guiding technical document is not applicable to the identification test of the sound insulation performance of the product. This guiding technical document uses an impedance tube, one or more microphones, and a digital acquisition & analysis system.